Knife rack



FIG. 1 is a top plan view of the knife rack (the bottom view corresponds);

FIG. 2 is a perspective view of the knife rack;

FIG. 3 is a front view of the knife rack;

FIG. 4 is a side view of the knife rack (the other side view corresponds); and,

FIG. 5 is a rear view of the knife rack. 

The ornamental design for a knife rack, as shown and described. 